MCQ
Choanocytes are present in
- APhysalia
- ✓Sycon
- CPleurobrachia
- DEchinus
In options, Physalia belongs to cnidaria/coelenterata. Sycon belongs to porifera/sponges.
Pleurobrachia belongs to ctenophora.
Echinus is a sea-urchins and belongs to Echinodermata.
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$I.$ Occurs between $G_1$ and $G_2$
$II.$ $DNA$ replication begins in the nucleus
$III.$ Centrioles duplicate in the cytoplasm
$IV.$ As $DNA$ s doubled, number of chromosomes also doubles Option are
$(A)$ $(B)$
$X$ in the given statement refers to